Good day! The child is stuffy in his nose at night. During the day eve…

Good day! The child is stuffy in his nose at night. During the day everything is fine. He breathes through his mouth, but at night his nose doesn't breathe at all. We have a tooth that is about to erupt. Could this be the reason? The reaction was only on the first two teeth, then they came out well. I didn't even notice it. Yesterday I looked, the gums were well swollen right there. And she became capricious. Stool is normal, without changes. There is a slight temperature. Tried to suck out with a syringe, but nothing comes out. No phlegm, and he can't breathe at night. Because of this, he often wakes up.